Bulged Barrel?

Discussion in 'Technical Questions & Information' started by ryan42, Sep 25, 2012.

  1. Jim K

    Jim K New Member

    Dec 6, 2009
    Hi, CCholder. No, but it doesn't have to. The highest pressure is in the chamber and right in front of it, which is why barrels are made thicker in that area. In normal firing, as the powder burns and the bullet moves up the barrel, the pressure decreases. IIRC, the port pressure (an inch from the muzzle) in an M1 rifle is only about 2000 psi. If it were still 50,000 psi, the op rod would be very unhappy.

    The same is true even more so without a bullet. Contrary to what is sometimes believed, few obstructions provide anywhere near the resistance of a normal bullet. Without that resistance and confinement, the powder burns poorly. The gas expands but acts like it is in a long cartridge case, so the pressure is a lot lower than in normal firing, and often the case is not even obturated, that is, the pressure is too low to expand the case neck to seal it and the case is heavily sooted. (In an excess of caution, I never use a full charge in shooting out an obstruction; 1/3 will usually do fine, with a cotton filler.)

    Last edited: Sep 27, 2012
  2. targetacqmgt

    targetacqmgt New Member

    Sep 21, 2012
    good point - oil it for storage, swab it out before firing??

  3. JLA

    JLA Well-Known Member

    Feb 26, 2007
    Heart Of Texas
  4. Jim K

    Jim K New Member

    Dec 6, 2009
    On the oil in the bore business, I would have to ask what is considered excessive. A barrel plugged with hard grease could be a problem, the same as a barrel plugged with mud. But I can't see how the thin coating of oil normally used to protect a barrel in storage would be enough of an "obstruction" to cause a barrel to bulge or burst. Of course, it could cause the first shot to go somewhere other than where the rifle is sighted, but that is not the same thing as barrel damage.

  5. Re: Glock Bulged Barrel? I decided to chime in here, Because 'See Below"

    Glock Pistols have an "UN-SUPPORTED" chamber and are not intended to fire RELOADS. If you want to shoot reloaded ammo in your glock, then have a aftermarket barrel fitted for it. Be thankful that it jammed and you could not chamber another round, you were very fortunate.
    More info. on this "BULGED BARREL" with the Glock can be found on:
    castboolits.com .

    {The reason I know this! Last week I started to research information on reloading for the Glock 40 S&W [duty issue] for my 'Almost half addopted Step-child' who now works part time for the local Court system as a bailif, deputy, probation/community service armed escort [aka chain gang guard].
    On his pay and WITH a young family he finds it 'tight' to shoot enough to keep in good practice. He had asked me to reload for his 40S&W. Since I had never fired a 'Glock' or the 40S&W, I went looking and the above is what I found!
    He will now practice with one of my 1911's or my S&W 9mm.
    PLEASE NOTE: I am not in any way harping on the 'Glock' firearm, from what I know of them? They are one of the finest semi-auto pistols in use today! However as with any firearm, if you are going to use reloaded ammo. first do your homework and keep it safe.
    Last edited: Oct 4, 2012
  6. Jim K

    Jim K New Member

    Dec 6, 2009
    Glocks do not have an "unsupported chamber". In the Glock, the cartridge is not as well supported at the lower rear than with some other guns, and that has reportedly caused problems with some ammunition, both reloads and factory ammo.

    But there is no, let me repeat, NO, indication that proper reloads are going to blow up a Glock or any other gun. Of course, reloads that have excessive powder charges or that use defective or excessively worked cases can be a problem in any gun, but the blanket statement that reloads will damage a Glock is simply not true.

    As I said before, ALL gun makers advise against use of reloads for the simple reason that they can't and won't assume any liability for their gun if used with ammunition of unknown origin and unknown loadings.

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